Micromechanics analysis for the Structure damping of thin-walled composite two-cell beams

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (23) : 158-165.

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Micromechanics analysis for the Structure damping of thin-walled composite two-cell beams

Ren Yongsheng1 Song Yubi1 Sun Shuangshuang2

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Abstract

This paper presents a theoretical study of the damping of thin-walled composite two-cell beam. The micromechanic damping theory for fiber composite materials is employed to evaluate the damping capacity of the composite beam.The equations of motion of the beams are derived using Hamilton’s principle combined with variational asymptotically approach(VAM). The Galerkin’s method is used in order to solve the coupled differential equations. Analytical formulas of the modal damping of the beam are derived on the basis of maximum strain energy theory. Comparison of the theoretical solutions has been made with the results obtained from the finite element method. Numerical results are obtained for various layup cases of two-cell composite box beams. The effects of fiber orientations and the fibre volume fraction on modal damping are investigated.

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structural damping / thin-walled composite beams / flutter suppression

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Ren Yongsheng Song Yubi Sun Shuangshuang . Micromechanics analysis for the Structure damping of thin-walled composite two-cell beams[J]. Journal of Vibration and Shock, 2012, 31(23): 158-165